Catalyst component for polymerization of olefins

Abstract

A catalyst component for polymerization of olefins which is prepared by reacting a magnesium alkoxide with a silicon compound having at least one hydrogen-silicon bond, contacting the reaction product with a carboxylic acid halide and/or carboxylic acid anhydride, and contacting the resulting contact product with a titanium compound.

What is claimed is: 
     
       1. A process for the polymerization of olefins which comprises homopolymerizing ethylene or copolymerizing ethylene with an alpha-olefin in the presence of a catalyst system comprising (a) a titanium containing catalyst component obtained by reacting (A) Mg(OR)(OR') with (B) a silicon compound having at least one silicon-hydrogen bond, contacting the reaction product with (C) a carboxylic acid halide, a carboxylic acid anhydride, or mixtures thereof, and contacting the resulting contact product with a divalent, trivalent, or tetravalent titanium compound selected from titaninum halides, alkoxy titanium compounds and haloalkoxy titanium compounds, wherein R and R' are radicals selected from alkyl, alkenyl, cycloalkyl, aryl, and aralkyl radicals and R and R' may be the same or different   (b) and an organoaluminum cocatalyst.   
     
     
       2. The process in accordance with claim 1 wherein the titanium compound is tetravalent. 
     
     
       3. The process in accordance with claim 2 wherein the titanium compound is titanium tetrachloride. 
     
     
       4. The process in accordance with claim 1 wherein R and R' are alkyl radicals having from 1-8 carbon atoms, the silicon compound is trichlorosilane, and the carboxylic acid derivative is selected from benzoyl chloride and benzoic anhydride. 
     
     
       5. The process of claim 4 wherein R and R' are ethyl. 
     
     
       6. The process in accordance with claim 1 wherein the catalyst component is recovered and prior to washing, contacted at least an additional time with the titanium compound.